I find a very good paint for indoor, & outdoor when baked, use on both glass & ceramics etc is the Folk Art Enamels range that includes metallics & other special colours as well as a good range of standard colours.
We sell some of them on our website & that's how I got to experiment with them.
They are lovely high pigment paints that have the same colours as the ordinary Folk Art Acrylics range that they use in the "One Stroke" painting technique.,, so you can co-ordinate your walls & accessories etc for a total look without spending a fortune!
I love them!!